diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 717e5a2e..0afae2fe 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -6,7 +6,7 @@ test-jdk = "17"
 build-plugins = "2025.9"
 
 # using the embedded kotlin version of gradle to avoid mixed versions
-kotlin = "2.2.20"
+kotlin = "2.2.21"
 checker = "3.51.1"
 checkerp = "0.6.56"
 jacoco = "0.8.11"